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Study of grain boundary transparency in(Yb1−xCax)Ba2Cu3Obicrystal thin films over a wide temperature, field, and field orientation range
The residual low-angle grain boundary (GB) network is still the most important current-limiting mechanism operating in biaxially textured rare-earth barium-copper-oxide (REBCO) coated conductors. While Ca doping is well established to improve supercurrent flow across low-angle GBs in weak fields at high temperatures, Ca doping also depresses ${T}_{c}$, making it so …